CVE-2026-98752
Published: October 21, 2026Last modified: November 3, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: tty: port: fix tty_port_tty_vhangup() race Drivers rely on tty_port_tty_vhangup() to synchronously hang up their ports before tearing down resources as part of deregistration (e.g. on physical disconnect). If tty_port_tty_vhangup() races with another hangup it may however return before the port has been shut down. This is in turn can lead to use-after-free and NULL-pointer dereferences in racing ioctls (including a synchronous hangup) and in processing of racing asynchronous hangups (carrier loss). Add the missing serialisation to tty_port_tty_vhangup() and tty_port_hangup() so that the former does not return until the port has been shut down also when there is a racing hangup. Note that serial core does not use tty_port_hangup(), but it already holds the port mutex when clearing port->tty and shutting down the port in uart_hangup().
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.191-r0) |
| 25 LTS | linux-lts | Fixed (6.12.115-r0) | |
| Stream | linux-lts | Fixed (6.18.58-r0) |
References
- https://git.kernel.org/stable/c/017b18addbe8dcace1a569a00d40ed1ba1e03f4c
- https://git.kernel.org/stable/c/2e16ae1464a4f435425c6f6ff1e293db850a624c
- https://git.kernel.org/stable/c/6b7be3b9b857947e9c1338d4919d4ebd3b75e907
- https://git.kernel.org/stable/c/6d1a984afc3ca477dab3e51ec806671d443ad524
- https://git.kernel.org/stable/c/a776d603d1e1bba2837295817b0a39394707b10d
- https://git.kernel.org/stable/c/a78910f6d78cc1415cbc9b4fb621c3f4f6945be2
- https://git.kernel.org/stable/c/b48820de8c1a596c5b99775524dfce73c6576c5d
- https://git.kernel.org/stable/c/ce220b4cdf62f73db0c1940f968eb33b9899fdd0